@article{VM_2009_11_3_a0,
     author = {Alexander Astrom and Christoffr Astrom},
     title = {Octagonal {Knotworks.} {A} {Mathematical} {Approach}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2009_11_3_a0/}
}